I'm really hoping it's a generic garage band theme (a la Al's Garage Band) with generic music, but includes an option to Bluetooth in the music of the player's choosing through their phone (hence "dialed in").
This way everyone can suddenly turn their Bluetooth on load a band's playlist, and suddenly have their Queen/Maiden/Sabbath/Zeppelin/Nirvana/Tool/Megadeth/Rush/Van Halen/Slayer pin all in one.
"Dialed In" may have more than one meaning. Everyone just assumes it's going to be a cell phone theme pin. Really? What, you think Pat Lawlor is going to design a game where you have to fight between the Verizon/Sprint nerd and the AT&T chick or something? Or maybe you have to hit shots to spell out a late night text to your nagging girlfriend???
I wouldn't be surprised if "Dialed In" means that it interacts with a phone in a small way and perhaps also is a small hat tip to the phrase we always use it as which is a machine that has a ton of good shots that are "dialed in".